Guides
Device & human-performance guides
Understand device symptoms and performance results before deciding what to do next. Our guides explain microphone, webcam, keyboard, mouse, screen-pixel and controller checks alongside reaction timing, typing, clicking, memory and aim measurement — including what the browser can and cannot determine. For the procedure of an individual test, its test page remains the reference.
Published guides
Device troubleshooting
- How to Test a Used Laptop Before Buying ItCheck a used laptop with browser display, input, camera and audio tools plus manual battery, ports, condition and ownership checks. No fake hardware health score.
- Touch Screen Not Working? Test Dead Zones and Ghost TouchTroubleshoot missed taps, edge problems, multi-touch and unwanted touch events with slow coverage mapping, safe cleaning and clear browser limitations.
- Keyboard Ghosting, NKRO and Key Rollover ExplainedUnderstand blocking, phantom input, 6KRO and NKRO. Test simultaneous gaming combinations with accurate browser-observation limits and reserved-shortcut context.
- Monitor Stuck at 60Hz? How to Check Your Refresh RateCheck OS refresh settings, cable and port limits, power modes, multiple monitors and VRR. Understand why a browser estimate can differ from display output.
- Why Is My Microphone Not Working? Troubleshooting GuideTroubleshoot a silent microphone: browser and OS permissions, input selection, mute, USB and Bluetooth, with a local mic check and clear limits.
- Why Is My Webcam Not Working? Camera Troubleshooting GuideTroubleshoot webcam permissions, a black preview, wrong camera selection and busy devices. Test your camera locally without recording or uploading video.
- Keyboard Keys Not Working? How to Test and Troubleshoot ThemCheck missing, repeating or stuck keyboard keys with browser events. Compare layouts, shortcuts, USB and Bluetooth before assuming a hardware fault.
- Mouse Double-Clicking by Itself? How to Test and Troubleshoot ItTest unwanted mouse double-clicks, buttons and scrolling. Compare timing settings, connections and applications before assuming a worn switch.
- Dead Pixel vs Stuck Pixel: How to Tell the DifferenceLearn to spot persistent dead, stuck, bright and subpixel defects with solid-colour screen tests, rule out dust, and decide what to check next.
- How to Test Controller Stick Drift and DeadzoneLearn how to check analog stick drift, read X/Y values, measure resting offset, and understand controller deadzones without mistaking a small offset for hardware failure.
Human performance & measurement
- How Reaction Time Tests WorkWhat a browser reaction time test actually measures: visual stimulus timing, performance.now(), frame-aligned presentation, false starts, and why display and input latency are part of every number.
- How WPM Is Calculated in a Typing TestThe words-per-minute formula explained: the five-character word convention, why Testpartout counts only correct characters, how the 60-second run and cumulative mistakes work, and a worked example.
- How Click Speed Tests WorkHow Testpartout measures clicks per second: the fixed 10-second session, first pointerdown start, primary pointer rules, deadline handling, local personal bests, and browser limitations.
- How Visual Memory Tests WorkHow Testpartout measures visual memory span with a fixed 6×6 grid, three starting targets, 1.5-second presentation, recall rounds, lives, and browser display limits.
- How Aim and Accuracy Tests WorkHow Testpartout measures aiming accuracy: 30 trials, circular hit detection, hit-only average time, target spacing, input modality, and why speed and accuracy stay separate.
Guides follow the same rules as the rest of the site: they describe the implementation as it exists, and they do not publish averages, rankings or percentiles that no real aggregated data supports. See the editorial policy and methodology.